稳定剂控制底泥中磷元素释放的机理性研究

The mechanism on preventing phosphorus releasing from sediments

以河流富磷底泥为试验对象,研究4种稳定剂对底泥磷元素释放的抑制效果和机理.结果表明,高锰酸钾和过氧化氢控制底泥释磷的持续性较差,投加高锰酸钾后底泥孔隙水的正磷酸根含量比对照高出0.344mg/L,过氧化钙和硝酸钙能够稳定地抑制底泥中磷的释放,可将孔隙水磷酸盐浓度分别降低至0.003,0.094mg/L.高锰酸钾和过氧化氢不能有效地降低底泥中NaOH-P含量,过氧化钙和硝酸钙主要通过提高HCl-P含量来控制磷的释放.

Experiments of preventing phosphorus release from P.rich sediments by 4 stabilizers were conducted. The P retard effects of KMnO4 and H2O2 were not effective, and PO4^3- concentration of porewater in the treatment of KMnO4 was 0.344mg/L higher than that of the control. P release was steadily controlled by the treatments of Ca2O2 and Ca（NO3）2, in which PO4^3- s in porewater were reduced to 0.003mg/L and 0.094mg/L, respectively. Mechanism analysis indicated that KMnO4 and H202 could not reduce NaOH-P effectively in the sediment, and Ca2O2 and Ca（NO3）2 were able to increase HCl-P capacity to prevent phosphorus release.